Overview

overview

10

Static

static

3

Krotten.exe

windows11-21h2-x64

10

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General

  • Target

    Krotten.exe

  • Size

    53KB

  • Sample

    240510-w7t7lsed89

  • MD5

    87ccd6f4ec0e6b706d65550f90b0e3c7

  • SHA1

    213e6624bff6064c016b9cdc15d5365823c01f5f

  • SHA256

    e79f164ccc75a5d5c032b4c5a96d6ad7604faffb28afe77bc29b9173fa3543e4

  • SHA512

    a72403d462e2e2e181dbdabfcc02889f001387943571391befed491aaecba830b0869bdd4d82bca137bd4061bbbfb692871b1b4622c4a7d9f16792c60999c990

  • SSDEEP

    768:4yKoNLsn4Jp9ZvRInygrpMoZN+WtOl08jxBEHCDwBLpZTPCUvQK:j/sn4/OycxZN+MKxp8t9zQK

Score
10/10
fantommimikatzbootkitevasionpersistenceransomwarespywarestealer

Malware Config

Extracted

Path

C:\g6QpgrhJDdQZeF0\DECRYPT_YOUR_FILES.HTML

Ransom Note
<html> <head> <style> body{ background-color: #3366CC; } h1 { background-color: RGB(249, 201, 16); } p { background-color: maroon; color: white; } </style> </head> <body> <center> <h1><b> Attention ! All your files </b> have been encrypted. </h1></br> <p> Due encrypting was used algoritm RSA-4096 and AES-256, used for protection military secrets.</br> That means > RESTORE YOU DATA POSIBLE ONLY BUYING decryption passwords from us.</br> Getting a decryption of your files is - SIMPLY task.</br></br> That all what you need:</br> 1. Sent Your ID_KEY on mailbox [email protected] or [email protected] </br> 2. For test, decrypt 2 small files, to be sure that we can decrypt you files.</br> 3. Pay our services. </br> 4. GET software with passwords for decrypt you files.</br> 5. Make measures to prevent this type situations again.</br></br> IMPORTANT(1)</br> Do not try restore files without our help, this is useless, and can destroy you data permanetly.</br></br> IMPORTANT(2) </br> We Cant hold you decryption passwords forever. </br>ALL DECRYPTION PASSWORDS, for what wasn`t we receive reward, will destroy after week of moment of encryption. </p> <p> Your ID_KEY: <br> </p> <table width="1024" border="0"> <tbody> <tr> <td><p>fnUXwfB1K1k7QB4cRhm6njLK5sL34DFQ47Ren7pxdUpE25KWg149wafRM8ECOEtyjN76kNjVBWtTVB2RIPRYh4f/I8nwi/TMOTeZGCjEp//jUzzqHeEJzMzACzKwut6cBUJxW/jnfukfQxDR157FK7nurEGQQfqGlobNvrW4cIfH8GAKDcQBdmyc90jmLp8O5jbz5RwwMXv05zfwyUc4589Q9vw9JYM4n5oNOHZmwLCFUGF4WjCRbMLxtpp2xAIgo4FYgwYofFACEB/Dfl2ricabEzfzYz/TJjageOv62JZHXJpkWArGDMLfX4sXIjpjgSOwyvhIuy7hJM6RBu4pOg==ZW4tVVM=</p></td> </tr> </tbody> </table> </center></html></body>

Extracted

Path

C:\PerfLogs\DECRYPT_YOUR_FILES.HTML

Ransom Note
Attention ! All your files have been encrypted. Due encrypting was used algoritm RSA-4096 and AES-256, used for protection military secrets. That means > RESTORE YOU DATA POSIBLE ONLY BUYING decryption passwords from us. Getting a decryption of your files is - SIMPLY task. That all what you need: 1. Sent Your ID_KEY on mailbox [email protected] or [email protected] 2. For test, decrypt 2 small files, to be sure that we can decrypt you files. 3. Pay our services. 4. GET software with passwords for decrypt you files. 5. Make measures to prevent this type situations again. IMPORTANT(1) Do not try restore files without our help, this is useless, and can destroy you data permanetly. IMPORTANT(2) We Cant hold you decryption passwords forever. ALL DECRYPTION PASSWORDS, for what wasn`t we receive reward, will destroy after week of moment of encryption. Your ID_KEY: kVBsqf39eS0kJ8LYw7s9aWgCoCecKYJZ1QtZU8bWs+1ge7rRFAuB9eXjeEuAbhOMA/lpFKlcyd9Ga67nRtOY8xTZ5U6R0Ju39VeiS/5Zng6ktBfUVXbxglnGmm+/MGGRKUcAp2xoDshl3bFcDqS/hPjwUi5c/CLKmWghWyxL84mBwx9bKivmF+gFlnnL4dOEQVyTvhj09FKbAuVintBz9mL+eohY2YIsyi0tKFLwqpNij+TRZCmeEUdFC9vwK5sxnhhoKEzXVTelH+rRhMG81EUTiknTJpTQfKi+n4NBXgPi5LeJUcHSCOSrMNhYdw+9J8pHYL2SKzvcEcPIjyOGOg==ZW4tVVM=

Targets

    • Target

      Krotten.exe

    • Size

      53KB

    • MD5

      87ccd6f4ec0e6b706d65550f90b0e3c7

    • SHA1

      213e6624bff6064c016b9cdc15d5365823c01f5f

    • SHA256

      e79f164ccc75a5d5c032b4c5a96d6ad7604faffb28afe77bc29b9173fa3543e4

    • SHA512

      a72403d462e2e2e181dbdabfcc02889f001387943571391befed491aaecba830b0869bdd4d82bca137bd4061bbbfb692871b1b4622c4a7d9f16792c60999c990

    • SSDEEP

      768:4yKoNLsn4Jp9ZvRInygrpMoZN+WtOl08jxBEHCDwBLpZTPCUvQK:j/sn4/OycxZN+MKxp8t9zQK

    Score
    10/10
    fantommimikatzbootkitevasionpersistenceransomwarespywarestealer

    • Fantom

      Ransomware which hides encryption process behind fake Windows Update screen.

      ransomwarefantom

    • Mimikatz

      mimikatz is an open source tool to dump credentials on Windows.

      mimikatz

    • Renames multiple (4917) files with added filename extension

      This suggests ransomware activity of encrypting all the files on the system.

      ransomware

    • mimikatz is an open source tool to dump credentials on Windows

    • Disables RegEdit via registry modification

      evasion

    • Disables Task Manager via registry modification

      evasion

    • Downloads MZ/PE file

    • Drops startup file

    • Executes dropped EXE

    • Loads dropped DLL

    • Reads user/profile data of web browsers

      Infostealers often target stored browser data, which can include saved credentials etc.

      spywarestealer

    • Adds Run key to start application

      persistence

    • Drops Chrome extension

    • Legitimate hosting services abused for malware hosting/C2

    • Modifies WinLogon

      persistence

    • Writes to the Master Boot Record (MBR)

      Bootkits write to the MBR to gain persistence at a level below the operating system.

      bootkitpersistence
    behavioral1

MITRE ATT&CK Enterprise v15

Tasks